Just like any other drug, most of the people who use these drugs do so without a problem. - Carl Hart

After reading this book, I hope you will be less likely to vilify individuals merely because they use drugs. That thinking has led to an incalculable number of deaths and an enormous amount of suffering. I hope you will come away with an appreciation for the prodigious potential good derived from drug use and a deeper understanding of why so many responsible grown-ups engage in this behavior. (Author's Note)

Each and every day, we all are faced with potential risks and must make risk-to-benefit calculations repeatedly. This is a basic fact of life. Our right to make decisions based on the outcome of these calculations is not outlawed by the government, except when it comes to certain recreational drugs. (Chapter 2)

I am an unapologetic drug user. I take drugs as part of my pursuit of happiness, and they work. I am a happier and better person because of them. I am also a scientist and a professor of psychology specializing in neuroscience at Columbia University, known for my work on drug abuse and addiction. It has taken me more than two decades to come out of the closet about my personal drug use. Simply put, I have been a coward.